Is it too late to plant cleome seeds in late June?
Planting Cleome Seeds
Certified GKH Gardening Expert
While planting them a month or so ago may have been better, you can still sow your cleome seeds now. I would sow them directly in the garden. Cooler weather prevents them from germinating, so at least the warmer June temps should help them along. Just keep the area moist. Here is more information on growing these plants: https://www.gardeningknowhow.com/ornamental/flowers/cleome/growing-cleomes.htm